Study the pedigree chart given below.

What does it show?

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Inheritance of a condition like phenylketonuria as an autosomal recessive trait.

Inheritance of phenylketonuria as a sex-linked inborn error of metabolism.

Inheritance of myotonic dystrophy.

Inheritance of a recessive sex-linked disease like haemophilia.

answer is D.

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Detailed Solution

The pedigree chart has affected offspring with unaffected parents, which clearly indicates that the trait is recessive. It is equally affecting both males and females, indicating that the trait is autosomal. Inheritance of a condition like phenylketonuria as an autosomal recessive trait.

Myotonic dystrophy is autosomal dominant disorder.

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